Fraction of mergers classified as disks based on the criteria described in Sects. 6.1 (left, red bars) and 6.2 (right) as a function of resolution. In the left panel, the light blue and dark green bars show the fraction of galaxies with smooth velocity maps and V/σ ≳ 1.8. The latter are obtained using the velocity-gradient method for correcting for beam smearing. The non-zero fraction at N_IRE ∼ 7.5 is due to the low S/N mock data. In the right panel, we show the fractions obtained using the Shapiro et al. (2008) and Bellocchi et al. (2012) methods as green and orange bars, respectively. Using the classification method described in Sect. 6.1, the only non-zero fraction of misclassified disks is obtained for N_IRE ≲ 2 when the velocity-gradient method is used for correcting for beam smearing. In this case, 50% of disks are classified as dispersion-dominated systems. Using the kinemetry-based method all disks are correctly classified.